<template>
    <view>
        <view class="search-box">
            <uni-search-bar @input="input" :radius="100" cancelButton="none" placeholder="请输入搜索内容" ></uni-search-bar>
        </view>
        
        <!-- 搜索建议列表 -->
        <view class="sugg-list" v-if="searchResults.length !== 0">
            <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
                <view class="goods-name">{{item.goods_name}}</view>
                <uni-icons type="arrowright" size="16"></uni-icons>
            </view>
        </view>
        
        <!-- 搜索历史列表 -->
        <view class="history-box" v-else>
            <!-- 标题区域 -->
            <view class="history-title">
                <text>搜索历史</text>
                <uni-icons type="trash" size="17" @click="clean"></uni-icons>
            </view>
            <!-- 列表区域 -->
            <view class="history-list">
                <uni-tag :text="item" v-for="(item,index) in histories" :key="index" @click="gotoGoodsList(item)"></uni-tag>
            </view>
        </view>
    </view>
</template>

<script>
    export default {
        data() {
            return {
                // 延时器的 timerid
                timer: null,
                kw:'',
                searchResults: [],
                // 搜索历史数组
                historyList:['a','app','apple']
            };
        },
        methods:{
            // input 输入事件的处理函数
            input(e){
                // 清除 timer 对应的延时器
                clearTimeout(this.timer)
                this.timer = setTimeout(()=>{
                    this.kw = e
                    this.getSearchList()
                },500)
            },
            async getSearchList(){
                if(this.kw === '')
                {
                    this.kw = ''
                    return
                }
                const {data : res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query: this.kw})
                if( res.meta.status != 200) return uni.$showMsg()
                this.searchResults = res.message
                
                this.saveSearchHistory()
            },
            gotoDetail(item){
                uni.navigateTo({
                    url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
                })
            },
            saveSearchHistory(){
                // this.historyList.push(this.kw)
                const set = new Set(this.historyList)
                set.delete(this.kw)
                set.add(this.kw)
                
                this.historyList = Array.from(set)
                
                uni.setStorageSync('kw',JSON.stringify(this.historyList))
            },
            clean(){
                this.historyList = [],
                uni.setStorageSync('kw','[]')
            },
            gotoGoodsList(kw)
            {
                uni.navigateTo({
                    url:'/subpkg/goods_list/goods_list?query=' + kw
                })
            }
        },
        computed:{
            histories(){
                return [...this.historyList].reverse()
            }
        },
        onLoad(){
            this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
        }
    }
</script>

<style lang="scss">
.search-box{
    position: sticky;
    top:0;
    z-index: 999;
}
.sugg-list {
    padding: 0 5px;
    .sugg-item {
        font-size: 12px;
        padding: 13px 0;
        border-bottom: 1px solid #efefef;
        display: flex;
        align-items: center;
        justify-content: space-between
    }
    .goods-name{
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        margin-right: 3px;
    }
}
    .history-box{
        padding: 0 5px;
        .history-title{
            display: flex;
            justify-content: space-between;
            height: 40px;
            align-items: center;
            border-bottom: 1px solid #efefef;
        }
        .history-list{
            display: flex;
            flex-wrap: wrap;
        }
        .uni-tag{
            margin-top: 5px;
            margin-right: 5px;
        }
    }
</style>
